Many students have the same or similar high school grades so how do universities choose between the hundreds of people who apply to their courses when they have not met any of these people? The personal statement helps with this process. What is a personal statement? A personal statement is basically information about you but it helps admissions staff decide if they want to offer you a place on a specific course at their university. All universities have a certain image and they are looking for more than just your grades at high school; they want to know if your personality, attitude and life experience will "fit" with their university. Think of it like a job application. When you apply for a job you have to write a personal statement which tries to persuade the company that you are the best person for the job. In the same way the personal statement aims to persuade universities that you are the kind of student they want.
To help you begin the writing phase, it is advantageous to split the writing task into three parts: the body, the conclusion, and the introduction. You can do so chronologically or follow your own sequence depending on your personal preference and style.